帖子post重提交

Change-Id: Ib28dc79d604faf43233c720031a4f18d84b22688
diff --git a/src/main/java/com/pt5/pthouduan/service/PostService.java b/src/main/java/com/pt5/pthouduan/service/PostService.java
index fabf254..7db4d26 100644
--- a/src/main/java/com/pt5/pthouduan/service/PostService.java
+++ b/src/main/java/com/pt5/pthouduan/service/PostService.java
@@ -43,4 +43,6 @@
     List<Post> findPinnedPosts();                    // 查找所有置顶帖子
 
     List<Post> getAllPostsSorted();                  // ✅ 获取所有帖子(置顶优先,按时间排序)
+
+    Post getById(Integer postid);
 }